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A Revised Transformation Protocol for Unconditionally Secure Secret Key Exchange |
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| Authors: | Koichi Koizumi Takaaki Mizuki Takao Nishizeki |
| Affiliation: | (1) Department of Electrical Engineering, Fukushima National College of Technology, Tairakamiarakawa-Aza-Nagao 30, Iwaki-shi, Fukushima 970-8034, Japan;(2) Information Synergy Center, Tohoku University, Aramaki-Aza-Aoba 6-3, Aoba-ku, Sendai 980-8578, Japan;(3) Graduate School of Information Sciences, Tohoku University, Aramaki-Aza-Aoba 6-6-05, Aoba-ku, Sendai 980-8579, Japan |
| Abstract: | The transformation protocol can allow two players to share an unconditionally secure secret key using a random deal of cards. A sufficient condition on the number of cards for the transformation protocol to succeed was known. However, it has been an open problem to obtain a necessary and sufficient condition. This paper improves the transformation protocol and gives a necessary and sufficient condition for the resulting protocol to succeed. An early version of the paper was presented in Lecture Notes in Computer Science, vol. 3106. |
| Keywords: | Card games Random deal of cards Secret key exchange Key set protocol Transformation protocol |
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